Abstract
An investigation of magnetic properties of a MnO-ZnO-Fe2O3 ternary system, crystallized in various atmospheric conditions is reported in this paper. The initial permeability, maximum permeability, saturation magnetization, Curie temperature and hysteresis loop were measured for these ceramic ferrites. Also, the crystal structure of these specimens were examined by X-ray diffraction. It has been found that a high permeability region in the ternary system is markedly wider in the case of sintering in nitrogen than in air, because the excess hematite is reduced to magnetite in the region where the Fe2O3 content is more than 50 mol%. It has also been found that the line connecting the maxima of the initial permeability agrees with the lines of zero magnetostriction and minimum magnetic anisotropy and that manganese-rich ferrites sintered in nitrogen, exhibit a square hysteresis loop.
